Better path support for configs

[ty-porter]

Running the project from outside the project directory currently breaks because it can't find the right config schemas

This updates the path lookups to be relative to project root

• Fixes the bug with starting the project from an arbitrary location
• maintains support for the --config option, and better handles relative paths. Previously only supported child paths of project root, now you can put configs anywhere. .json file extension is optional
• Centralizes the directories in case we need to load files in the future. Updates a few tests to use them.
• Fixes a secondary bug where typos in the weather location caused a crash